Automatic station selector



Spt. l, 1936. H. HAMMONDQJR 2,052,708

AUTOMATIC STATION SELECTOR Original Filed May 25, 1932 2 Sheets-Sheet 1 raw/v7 sumo INVENTOR JOHN HAYS HA M 0ND JR. BY m A'ITORNEY p 1936- .1. H. HAMMOND, JR 2,052,703

AUTOMATIC STATION SELECTOR Original Filed May 25, 1932 2 Sheets-Sheet 2 lmlrlll I INVENTOR JOHN HAY HA MGND JR- BY 7' mm,

ATTORNEY Patented Sept. 1, 1936 PATENT OFFICE.

AUTOMATIC STATION SELECTOR John Hays Hammond, Jr., Gloucester, Mass., as-

signor to Radio Corporation of America, a

corporation of Delaware Application May 25, 1932, Serial No. 613,361

. Renewed January 4, 1936 25 Claims.

The present invention relates broadly to communication systems and more particularly to automatic program selecting means therefor.

Briefly, the present invention relates to an 5 automatic program selector to be used in conjunction with tunable receiving apparatus wherein settable means are provided which condition the automatic program selector mechanism so as to be responsive to a predetermined transmitted signalindicative of the type of program to be transmitted from a suitable transmitter station.

An object of this invention is to provide an automatic means in'connectionwith a radio receiver which can be set to pick-up any desired type of broadcastprogram, such for example as dance music, opera,"s'ports, etc.

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims.

The invention itself, however, both as to its organization and method 'of operation will best 5 be understood by reference to the followingdescription taken in connection with the accompanying drawings in which:.

Fig. 1 is a diagrammatic view of the invention as applied to a radio receiver.

Fig. 2 is a sectional elevation taken on line 2--2 of Fig. l. I V

Fig. 3 is a sectional elevation taken on line 3--3 of Fig. 1.

Fig. 4 is a sectional elevation taken on line 4-4 of Fig. 1.

Fig. 5 is a. sectional elevation taken on line 55 of Fig. 1.

Fig. 6 is a diagrammatic view of the transmitter used in connection with this invention.

Fig. '7 is a second type of commutator used in connection with Fig. '6. a 3 Fig. 8 is a third type of commutator used in 4 connection with Fig. 6.

Referring to the formof the invention shown in Figs. 1 to 6 a standard radio receiver 6 is used which isprovided'with an antenna 5 and a ground connection 5|2. The tuning condensers of this receiver are so constructed that they can'be continually rotated and the shaft 5| 3 on which the moving plates are mounted may project outside the receiver 5|!) as shown and is secured there to a worm wheel 514 which meshes with a worm 5l5 which is mounted on the shaft of a motor 516. This motor is connected'by two conductors 5!! and 518; the former of which is connected to a battery 5l9 and the latter to a switch 521. The other side of the battery 5l9 is connected by a conductor 522 to a contact 523 which is mounted on but insulated from the frame 524 of the selector mechanism.

The switch 52l is connected by conductor 525 to a second contact 526 which is also mounted 5 on and insulated from the frame 524. Pivoted to this frame is an L-shaped member 521; one arm of which is connected by a spring 528 to the frame 7 524. The other arm is provided with an insulating button 529 which engages the contact 523. The upper end of this arm is provided with a piece of insulating material 53| which engages the two arms of the U-shaped contact 532, which is mounted on a plate of insulating material 533. Adjacent to one arm of the contact 532 is a second contact 534. The contact 532 is connected by a conductor 535 to one side of the output circuit of the receiver 5) and the contact 534 is connected by a conductor 536 to one terminal of a loudspeaker 531. The other side of .the output circuit of the receiver 5| 0 is connected by a conductor 538 .to the other terminal of the loudspeaker 531. Adjacent to the contact 532 is a third contact 539 which is connected to one side of the primary of a transformer 54l; the other side of which is connected to the conductor 538. xSlidably mounted in the plate 533 are four rods 542, 543, 544 and 545; to the upper ends'of which are secured disks 546, 541, 548 and 549 respectively. These disks are suitably engraved with the words Re-set, Dance, Opera, Sports, etc. To the lower ends of these rods are secured fourcone-shaped members 55l, 552, 553 and 554 the member 551 being provided with a cylindrical section 555. Between the plate 533 and the disks 546, 541, 548, and 549 are four springs 556, 551, 558 and 559 respectively.

Slidably mounted in two brackets 561 and 562 is a plate 563; to the right hand end of which is connected a spring 564'; the other end of which is connected to a bracket 565 carried by the plate 533. In theplate 563 are four circular openings 564, 565, 566 and 561. Theseopenings are slightly larger than the corresponding cones. Located below the cone 552 is a pair of cooperating contacts 568 and 569. Below the cone 553 is a pair of cooperating contacts 5H and 512 and below thecone 554 is a pair of cooperating contacts 513 and 514. These contacts may be suitably mounted on but insulated from the frame 524 and also from each other.

The contacts 569, 512 and 514 are connected by conductor 515 to one side of the winding of an electro-magnet 516; the other side of the winding of which is connected by a conductor 511 to one otherside of the secondary winding of the trans v former 541. The magnet 586 is located on the casing of the clockwork mechanism 588 which is wound by means of a square pin 589. Pivotally mounted adjacent to the magnetgE-BS 'is an armature 591 which is bent to engage'the toothi 592 of a single tooth ratchet wheel 563. This wheel is secured to the shaft of :the clocke work mechanism 588. Also secured to the shaft 56 1 is a commutator 595 made of insulatingmaterial and provided with a conducting segment Located around this commutator are four pairs of .contacts, 591- 558, 61J1662, 6636611, and '665686. For the particular embodiment shown, these pairs of contacts are arranged so that contact segmentf596 will engage 591 and 598, when it has rotated 76 clockwise from the position shown in Fig. 1; 661 and' 662 when rotated 179; .663and 604 when ,rotated 240; and,

V 665 and 666 when rotated 300. Located adjacent to' the armature.591 are two contacts 667 and 668.

The contacts 668, 568 and L601, are connected together and thecontact 661 is connected by a conductor 669 to the contact 6115 and through a switch 611 to one side of a battery '6112, thence by a conductor 613 :to two electro-magnets .614

' and 61.5 mounted on a'irame 623 (see Fig. "2).

The other side ofjthe windings of these magnets are'connectedby conductors 616, 611 to the contacts 5'91 and682 respectively. The conductor 613 is connected by .a branch conductor 6.18 to two solenoids 62'1 and 622 which are mounted on a frame 623 'thelother side of the windings of these solenoids are connected 'by' conductors 626 and 625 to the contacts 666 and 6114 respectively.

Located adjacent to the magnets 614 and 615 are'two 'L-shaped' armatures 626 and 621 which of the solenoid "62 1 are mounted on 'rods .628 and 629. These rods arepivoted in the frame work 623 and have secured thereto :fiat plates 631 and 632. Located adjacent to thearmature 626 and 621 is a rod 633 provided with two teeth 634 and 635. The lower endof the rod 633 is'pivoted to the core6 36 Acol1ar'631 is pinned to this core and between this collar and the solenoid is mounted a spring 638.

Slida'bly mounted in the frame 623 are three Y-shaped'members 641, 642 and 663i The member 641 (see Fig. 3) is provided with three teeth 664, 665 and 666. The teeth Bflfi-and 645 cooperate with the plates 631 and 632 and the tooth 6416 engaging the frame 623. The member 662 is provided-with threeteeth'646', 661 and 646 which engage the plates 631, 632 and the frame 623 respectively. The member 663 is provided with three teeth 65-1. '652 and 653 which enga e the plates 631,632 and the frame 623-respecti-vely.

'Slidably mounted on the lower part of the members 641, 642 and 6 13' are three "collars 654; pinned to the three members 661, 6fi 2 and 6 53 are .three collars 655. Between the collars 656 and 655 are three springs 656 andjbetween the collar .655 and the frame 623 are three springs 6.51. The springs 656 are much stronger than the springs651. Engaging the collars 654 are six arms .658 whichlare secured toashaft 659; .to

the end of this shaft is secured an arm 661 to which is pivoted a link 662; the other end of which is pivoted to the ,core 663 of the solenoid 622.

Located adjacent to the lower end of the member 641 is a pair of. cooperating contacts 664 and 665. Located adjacent to the end of member'642 is a pair'of cooperatingrcontacts .666 and 661 and located adjacent to the end of the member 643 is a a pair of cooperating contacts 668 and 669. These contacts may be suitably mounted on but insulated from the frame 625. The contacts 665, 661 and 669 are connected by a conductor 611 through a'switch 612 to one terminal of a battery 518, the contacts 664, 666, and 668 "are 'connected'by' conductors 612, 613 and 614 to ithe'contactsi568,1511 and 513 respectively. Inthe transmitter shown in Fig. 6 the conductors 615 .and 616 of the keyingcircuit are connected through a switch 611 to two contacts 618 and 619 respectively. These.contacts are located 1 adjacent to a commutator 681 mounted. on the shaft 682 of a clockwork {mechanism 683. ,This mechanism is wound by means of the square pin .666 and is startedand stopped by'me'ans of a lever 666. In the particular embodiment shown; the commutator .681 is'made of insulating ma-v terial and is provided with two conducting segments 6'81 and 688 spaced apart. .I In Figs. 2

'7 .and '8 are shown two other forms of commutator 69.1 and 692; the commutator 691 being provided with three segments of conducting material 663, 694, which.are45 apart, and 69.5 which is 60 apart from .694; and the commutator692 being provided with two' segments of conducting material 696 and 691 spaced45 apart.

For the particular angles chosen above the commutator 595 at the receiver revolves 137 times as fast as com mutators 681, 691 or 692. [In the operation of this invention if it is desame is broadcast from 'a station 'the' key .548 marked Q'pera is depressed, the cone 553'then pushes the plate 563 to .the left (Fig. 1) until it passes through theopening 566. When .theplate 563 is moved to the left, it releases any one of the keys which had previously been depressed; The

depression of thekey 548 causes the contacts 511 and 512 to contact with each other. The switch 521 is then closed thus starting the motor 516 which causes the shaft 513 to be slowly rotated, thus rotating the plates of the tuning condensers. In this way the receiver 510 is being successively tunedto all the various broadcast stations. 'Just before the operatic program is put on at any'given broadcast station the commutator 661 which is marked Opera is placed on the shaft 682 and is secured thereto. The lever 686 is then moved so as to start the clockwork mechanism going thus rotating this disk at a predetermined speed. As

contacts 618 and 619 thereby closing the keying circuit of the transmitter which sends out a short signallon its broadcast wave length. 1 1

After the commutator 6.81 has rotated a tain additional. amount the segment 688 will engage the-contacts 618 and 619 and another short signal will .besent out. In this way two short signals .at a given interval apart are continually sentout for a predetermined .length of. time before the broadcast of the opera starts.

Thesesignalsare picked up by the antenna 51 1 r and passed into the receiver .516. As the plates of the tuning condensers of this receiver slowly rotate there will come-a time whenthe receiver 7 5;

. this disk rotates the segment '681-will engageithe 40. sired to pick-up an opera program when the will be tuned to the wave length of the broadcast station. At this time the signals will be amplified by the receiver and fed over .the outputcircuit over the conductor 535, contacts 532 -and-539, through the'primary of the transformer 54!. and back over the conductor 538. The current in the secondary of the transformer 54! will be rectified by the rectifier 583 and this rectified current will energize the magnet 586. The first of the two short signals to be received would then cause the armature 59! to be lifted out of engagement with the tooth 592 thus allowing the ratchet 593 to startrotating in a clockwise direction, thus causing the commutator 595 to be rotated in the same direction and as soon as the short impulse ceases the magnet 586 will become de-energized thus allowing the armature 59! to drop down under the action of gravity. The conducting segment 596 will then pass under the brushes 591 and 598 and as the contacts 661 and 668 are not engaged by the armature 59! no circuit will be, closed. When, how-' ever, the segment 596 passes under the contacts 66! and 692 the segment 688 on, the transmitting commutator 68! will be under contacts 618 and 619 so that a short signal will be transmitted at this, time. This will be received and amplified by the receiver 5!!) thus energizing the magnet 586 in the manner previously described which will lift'the armature 59! thus closinga circuit from the battery 6l2 through switch 6!!, conductor 666, contact 661, armature 59!, contact 668 to contact 66!, segment 596, contact 662, conductor 6!1, magnet 6! 5, and back along conductor 6! 3 to the battery 6! 2. This will energize the magnet 6!5 which attracts the armature 621 thus rotating the plate 632 to the position shown in dotted lines in Figs. 3 and 4.

. As the commutator 595 continues to rotate the segment 596 will pass under the contacts 663 and 666,'thus closing a circuit through the sole--. noid 622 which causes the core 663 to be moved downwardly thereby rotating the arm 66! and the shaft 659 ina clockwise direction as seen in Figs. 2 to 5. This causes a similar rotation of the six arms 658. These arms pushing down on the'collars 654 will press the springs 656 against the collars 655. This in turn will tend to move the three members 64!, 642 and 643 downwardly. The member 64! cannot move, however, as the tooth 664 engages the plate 63!. The member 643 cannot move as the tooth 65! engages the plate 63!. The member 642, however, is free to move as neither of the teeth 646 or 641 will engage the plate 63! or 632. As this member is moved downwardly the spring 651 will be compressed, this spring being weaker than the spring 656. At the same time the end of the member 662 will cause the contact 666 to engage the contact 661, thus closing a circuit from the battery'518 through switch 512, conductor 61!, contacts 661, 666, conductor 613, contacts 51 and 512, conductor 515, re1ay'516 and conductor 511 back to the battery 518, thus energizing the relay 516, thus moving the armature 519 to the right. This releases the L-shaped member 521 which is rotated in a clockwise direction. by the action of the spring 528. This motion allows the contact 523 to be disengaged from the contact 526 thus breaking the circuit of the motor 5|6 which is brought to a stop thus leaving the receiving set 5 i6 tuned to receive the opera broadcast.

'At the same time the piece of insulation 53! disengages the contact 532 from the contact 539,

thus breaking the circuit to the relay 586and causing the other arm of the contact 532.to engage the contact 534,. thus closing the circuit to the loudspeaker 531 whichgives out the opera which is being played at, the transmitting station. As the commutator 595 continues to rotate the segment 596will move under the contacts 665 and 666 thus energizing-the solenoid 62!. This will cause the bar 633 to be moved downwards-and the tooth 635 will engage the armature 621 thus rotating it in a clockwise direction to the position shown in Fig. 2, the armature 626 being already in this position.

The commutator 595 will then continue to rotate'until the tooth 592 engages the armature 59! which will then hold the commutator in the position shown in Fig. 1. When the commutator is in this position the circuits to the magnets 6M, SH! and the solenoids62! and 622 will be broken and all the parts will be returned to the positions shown in Figs. 1 to 5, under the action of the various springs associated therewith. I

It is thus seen that when the proper sequence of signals are sent out by the transmitter they will be received'by the receiver and cause the selector mechanism to operate if it has been previously set for this program by depressing the proper key.

If it is'desired to have dance music for example, the key 561 is depressed thus causing the cone 552 to be pushed through the hole .565. This will cause the plate 563 to be moved to the left thus releasing the key 568 which will be moved up to its normal position under the action of the spring 558. V

This will also cause the member 521 to be rotated in a counter clockwise direction until the armature 519 is moved in a like direction under the action of spring 58! thus locating the member 52! in the position shown in Fig. 1. As the key 561 is further depressed the cone 552 will pass entirely through the hole 565 thus allowing the plate 563 to be moved to the right under the action of the spring 564. When the member 521 was moved to the position shown the piece of insulation 53! was moved to the left thus causing the contact 532 to be disengaged from the contact 535 and causing the other arm of the contact 532 to engage the contact 539. In this way the circuit to the loudspeaker 531 is broken and the circuit to the relay 586 is closed. At the same time the contact 523 is caused to engage the contact 526, thusstarting the motor 5!6 which will cause the shaft 5!6 to be'slowly rotated as already described.

' Just before the broadcasting of the dance program the commutator 68! is removed from the shaft 682 and is replaced by the commutator 69!. The mechanism 693 is then started thus causing the commutator 69! to berotated in a clockwise direction. This will cause three short signals to be sent out in succession and at predetermined intervals by the transmitter. These signals will be picked up by receiver causing the relay 586 to be operated three times at predetermined intervals. The first time it operates it will release the ratchet wheel 593, thus allowing the commutator 595 to make a complete revolution at a predetermined speed. As the segment 596'moves under the contacts 591 and 598, the second impulse will be received thus moving the armature 59! and causing energization of the magnet 6M which will throw the plate 63! to the left as shown in dotted lines in Fig. 3. When these'gment 596 gets under the contacts 66! and 602 the third impulse will .be received i-thus moving the armature 55H upwardly and closin'g the circuit through the magnet i6I5 thus causing the plate 632 to be moved to the left as'shownby dotted lines in :Fig. 3. :When the segment 595 moves under the contacts 603 and 60 :the solenoid 622 will be energized but this time only-the member 64! will 'be allowed to move down as the two teeth Mfiand 645 are freed from the plates 63! and 632. The tooth 6460f the member 642 will engage the plate 63! thus preventing this member from being moved and the tooth 652 of themember 643 will engage the plate 632 thus preventing this member from being moved.

commutator 69-12 will be placed on the shaft 682 at the transmitter thus transmitting two short impulses in close succession. This will cause the operation of the member 663, thus stopping the rotation of shaft M3 in a proper position topickup the sports program.

If it is desired to reset mechanism without setting for any particular program the reset key 546 is depressed thus causing the 'cone 55| to I pass through the opening 584, thus moving the shown in Fig. 1.

plate 5533 to the left andreleasing any of the other keys which may be depressed. At the same time it moves the member 627 into the position The motor 5| 6 may then be stopped by opening the switch 52!. The key 546 will not stay down due to the cylindrical portion 555 preventing it from catching in the plate 563.

It will be evident to those skilled in the art that many variations may be made in the details of the structure and that .the invention is capable of other embodiments beside the one illustrated; therefore, it is not intended that the patent be limited except as necessitated by the prior art and indicated by the claims.

I-claim; p 1.;The method of program selection in radio broadcasting andthe like which comprises assigning to each .particular .type of program, as for example, opera, dance music, sporting events, etc.,- to be. transmitted from various stations, identifying signals, transmitting the particular identifying signals correspondingtd the :type of program to be transmitted from the various stations prior to the transmission of the-various programs therefrom, and utilizing the trans- -mitted identifying signals at the receiver for rendering the receiver responsive to a broadcasting station transmitting the desired program.

.2. The method of program. selection in radio broadcasting and the like which comprises as signing to each particular type of 'broadcast,,as for example, opera, dance music, sporting events, etc. vtoloe transmitted from various stations identifying signals, transmittingtheparticular idenf4 aoaagaos broadcasting station transmitting the desired program. a

13. .The :method of 7 station selection in radio broadcasting and the like which comprises assigning-to each particular type of broadcast as for' example opera, dance music, sporting events, etc. to be transmitted from various stations, a particular signal code, transmitting the signal code corresponding to the type of broadcast to be transmitted from each station prior to the transmission of the broadcast and at the receiving end selecting the particular type of 'broadeast desired by receiving the signal codes transmitted by'the various stations and tuning .the'

receiver to the wave length of the broadcasting to the particular type of broadcast desired.

'15 station sendingout a signal code corresponding 4; The method of program selectionin radio 7 stations transmit a signal code identifying the particular type of program tobe transmitted therefrom, which comprises, automatically and continuously tuning the receiver along the band of broadcasting frequencies which includes the frequencies assigned to the various stations, setting the receiver so as to be operatively respon sive to the identifying signal of the particular, type of program desired and utilizing the recep tion of this signal when the receiver is tunedto a broadcasting station broadcasting the'desired.

P g am for maintaining the receiver tuned t said station. a

6. In a' system of broadcasting wherein the various programs likely to 'be broadcast are grouped in classes and each class assigned an' identifying characteristic, preferably a code signal to be broadcast-by the transmitter prior to broadcasting the indicated programat the same wave length as that at which the program is to be broadcast, a-receiver including means adapted to be set so as to become operative upon receipt of the signal code corresponding to the particular class of program desired and ,means when'said last named means becomes operative for rendering said receiver responsive to a transmitting station broadcasting the desired program.

7. In a system of broadcasting wherein various programs likely to be broadcast over a plurality of transmitting stations are grouped in classes and each class assignedan identifying charac-' teristic in the form of a signal code, means at the transmitter stations for broadcasting the code signal corresponding to the-program to be broadcast thereby prior to broadcasting the indicated program from eachfof said transmitting stations in combination-witha receiver including means for utilizing the transmitted identifying signals for rendering the receiver operative to receive signals from a sending station'transmitting the signal code representative of the desired program. 8. In asystem of broadcasting wherein various programs likely to bebroadcast' from a plurality of, broadcasting stations are grouped in classes and each class assigned'thereto an identifying characteristic in the'form of a signal code, means at each of said broadcasting stations for transinittingthe particular identifying signal code corresponding to the program to betransmittedceiver is rendered responsive to a broadcasting station broadcasting the desired program.

9, The system as described in the next preceding claim which includes in combination therewith a translating device and means for rendering said translating device inoperative until the receiver has'become responsive to a broadcasting station transmitting the type of program desired.

10. The method of program selection in radio communication and the like which comprises assigning to any particular type of program broadcast from a broadcasting station an identifying signal, transmitting the particular identifying signal corresponding to that type of program just prior to the transmission of the program, intercepting the transmitted energy at a receiving point and utilizing the transmitted program identifying signal at thereceiving point to condition a receiver so as to receive from said station theparticular program corresponding to the program identification signals.

11. In a system of broadcasting wherein any particular type of program is assigned an identifying codesignal which is to be broadcast by a transmitter prior to broadcasting the indicated program, a receiver including means adapted to: be set so as to become operative upon receipt of the signal code corresponding to the particular type of program desired and means acting upon operation of said last named means for conditioning the receiver so as to render the desired program intelligible. 12. In combination with receiving apparatus provided with a variable tuning instrumentality adapted to be continuously varied from one end a .erable to set said mechanism, means operable upon operation of the key to set said mechanism for initiating the operation. of said motor to operate the tuning instrumentality and means upon receipt of the predetermined signal code for j rendering the settable. means operative to stop thereof being respectively representative of one particular class of program, means connecting said keys and said settable mechanism whereby operation of any one of the keys sets the settable mechanism so that the latter becomes operative upon receipt of the particular signal code represented by'the particular keyoperated, means controlled by the operation of one of said keys to set said mechanism to become responsive to a desired class of program, for effectively disconnecting the reproducer from the receiver, and means controlled by said settable mechanism upon receipt of a signal code representing the particular class of program set for, for effectively reconnecting said reproducer to the receiver.

14. In combination with broadcast transmitting apparatus, an auxiliary signalling device, means for connecting said auxiliary device to the transmitting apparatus for impressing auxiliary signals upon the transmitting apparatus, said auxiliary signalling device being provided with a plurality of operable keys for determining the character of the signals transmitted by the auxiliary signalling means, and means for interchangeably connecting any of said keys to the auxiliary signalling device whereby signals may be transmitted from the auxiliary signalling device to the transmitting apparatus having different characteristics.

15. In combination with a broadcast transmission system of the type wherein auxiliary signals are transmitted from the transmitter and utilized at a receiving point to afiect the operation of the receiver, an auxiliary signal generating device, meansfor connecting said generating device to the transmission apparatus for. impressing the auxiliary signals upon the transmission apparatus, said auxiliary signal generating device being provided with a plurality of connectible elements for determining the character of the signals generated by the auxiliary signal generating device, and means for interchangeably-connecting any of said elements to the auxiliary signalling device whereby signals having difierent characteristics may be transmitted from the auxiliary signalling device to the transmitting apparatus.

.16. In combination with a broadcast trans-- mission apparatus so as to thereby impress the auxiliary signals upon the transmission apparatus, said auxiliary generating device being provided with a' plurality of connectible' rotatable commutator elements each thereof having con ducting segments positioned so as to determine the character of the signals generated by the auxiliary signal generating device, commutator driving means and contact means for, electri callyconnecting the commutator segments to.

the auxiliary signal generating device.

17. The method of program selection in radio communication and related arts which comprises transmitting a series of independent signals each independently characterizing separate individual programs, continuously varying the tuning of a receiver within a frequency spectrum which includes the stations desired to be received and fixing the tuning of the receiver to receive identifying signal corresponding to the type of the desired broadcast at any point of the frequency spectrum at -whch an identifying signal corresponding to the type of program desired is received. I v r g p 18. In; asystem, of communication wherein eachclass of programs to be transmitted isas- V signed an identifying signal which is broadcastby a transmitter to classify; the program transmission therefrom, the method of program selection which comprises continuously varying the tuning of a receiver within a frequency spectrum which includes the frequencies at which the transmittingstations desired to be received broadcast, and f xing the tuning of the receiver at approximately the point of reception of the be received, means connected with the settable means and operable upon setting the settable means forcontinuously tuning the receiveriover' a band of frequencies which includes the stations desired to be received, andmeans acting upon operation of the settable means. by receipt of the; particular identifying signal for fixing thertuning ofthe receiver soas to remain tuned to the station transmitting the received identify-M er e-a I 20, a system of broadcasting wherein; each class of programs is assigned a particular idem.

' ti-fying signal this signal being broadcast by a;

transmitter toclassify the program transmissionstherefrorn a receiver including a plurality ofsettable meansadapted toqbe set so as to become operative upon receipt of; an identifying signal corresponding; to the particular class of program desired to be received; means connected with the'settable means andoperable upon setting the settable means for continuously tuning the receiver over a -band of frequencies whichincludes the frequencies of the stations desired to be received: means acting upon-,operationuof the settable means by receiptuof the particular identifyingflsignal for fixing-the tuning .of the receiver soas; tOj remain tuned to the station transmitting the received identifying signal and means-.actingupen operation of said last named. means for conditioning the receiver so as to render the desired program intelligible.

21;. .In a system of broadcasting, wherein various-receiver controlling-signals aretransmitted as, an; auxiliary signal by, various; broadcast sta-,

tionsi broadcastin at difierent frequencies lying within a predetermined frequency spectrum, a re,- ceiver including means adapted to be set so as to become; operative upon receipt of the controlling signal corresponding to the desired broadcast and means'acting. upon operation of saidlastnamed means for conditioning the receiver seas-to render the desired broadcast intelligible. o

2-2; In a'system of. broadcasting wherein ,va-: rious receiver controlling signals are transmitted: as: an auxiliary signal by various: broadcast stations broadcasting at difieren-tfrequencies lying:

withina predetermined frequency spectrum, the method of :broadcast selection which comprises:

varying the tu-ning of therecei-ver within thelfrequency spectrum and maintainingthe tuning; of

the: receiver constant at that point of the fre-{ quency spectrum at which the controllinggsigna-l corresponding to the desired broadcast;- is--re-' ceivedr r j 7 I,

' 23. In a systemof broadcasting wherein various receiver controlling signals are transmittedas an auxiliary signal by various broadcast Sta-r tions each thereof broadcasting at different frequencies lying within a predetermined band of frequencies, areceiver provided with areproducing device, settable mechanism connected with the receiver and arranged so as to be set to becomeresponsive to any one of the various receiver controlling-V signals, a plurality ofkeys each one thereof being" respectively representa tiveof one of the particular controllingsignals,

meansconnecting said keys and said settable mechanism whereby operation of any one of the keys acts to set the settable mechanism so that the latter becomes operative upon receipt of the particular receiver controlling signal represented" by the particular key operated, means acting upon operation of one of; said-keystoset said mechanism' to become responsive to'a desired receiver controlling signal, for effectively disconnecting the reproducer from the receiver, and means controlled by said settable mechanism upon receipt of the controlling signal for which the" mechanism has been set-for effectively reconnecting the reproducer to the receiver.

24,15n asignal broadcasting system wherein various program broadcasts are classified as to type and each class assigned an identifying code;

signal, the code signals being transmitted by a broadcast station as anauxiliary signalto indicate eaclr class of program transmission; a receiver including means settable so asto'becomei operative upon receipt of the signal code corresponding to the particular class of program de .siredand means acting upon operationof the settable meansfor conditioning the receiver so as to render the desired program intelligible; I a

25. In a system of'broadcasting wherein various receiver control-ling signals are transmitted as an auxiliary; sign-albyfivarious broadcast stal tionsbroadcasting atdiiferentfrequencies lying within a predetermined frequency spectrum; the

method of broadcast selection which comprises varying the tuning ofthe receiver within said frequency spectrum and: fixing the: tuning of the" receiver 'to: receive thed'esired broadcast at that point or the" frequency spectrumat which the r cert-trolling signal corresponding to thedesi redi broadcast is received; v Q

' JOHN J 

